 |
| Name |
krypton |
| Symbol |
Kr |
| Atomic Weight |
83.80 |
| Atomic Number |
36 |
| CAS ID |
7439-90-9 |
| Group Number |
18 |
| Group Name |
Noble Gas |
| Period Number |
4 |
| Origin of Name |
From the Greek, kryptos = "hidden." |
| Year Discovered |
1898 |
| Discovery Credits |
Discovered by Sir William Ramsay and M. W. Travers at
London, UK. |
| Class |
Non-Metallic |
| Color |
Colorless |
| Standard State |
Gas at 77 F & 298 K |
| Description |
Colorless, odorless gas present in the
atmosphere. Chemically inert to everything but
fluorine. 86Kr has an orange-red line in its atomic spectrum that is used
for the SI length standard where 1 meter = 1,650,763.73 wavelengths. One
meter was originally defined as 1 millionth the distance from the earth's
pole to the equator. |
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